16ecc430ca
Ensures that the Allow header is set for 405 responses from the proxy, as per RFC 2616. CORS preflight requests now require both the Origin and Access- Control-Request-Method headers to get a successful (200) response. The draft spec defines errors as a response with a non-200 status code. This patch sets the CORS error response code to 401 (Not Authorized). A later patch may choose to make this configurable. There is some ambiguity between RFC 2616 and the CORS draft spec around what to do when a CORS request is made but the cluster has no CORS information about the requested resource. This patch chooses to return an error in this case because it is what would be simplest for CORS client apps. Further improvements to the OPTIONS verb not included in this patch include support of more top-level resources (eg / or /v1/) or sending the configured constraints in the reponse body. Change-Id: I40be059e8bbf3737dafc4e6fefa7598d05669c60
744 lines
31 KiB
Python
744 lines
31 KiB
Python
# Copyright (c) 2010-2012 OpenStack, LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# NOTE: swift_conn
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# You'll see swift_conn passed around a few places in this file. This is the
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# source httplib connection of whatever it is attached to.
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# It is used when early termination of reading from the connection should
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# happen, such as when a range request is satisfied but there's still more the
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# source connection would like to send. To prevent having to read all the data
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# that could be left, the source connection can be .close() and then reads
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# commence to empty out any buffers.
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# These shenanigans are to ensure all related objects can be garbage
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# collected. We've seen objects hang around forever otherwise.
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import time
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import functools
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import inspect
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from eventlet import spawn_n, GreenPile, Timeout
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from eventlet.queue import Queue, Empty, Full
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from eventlet.timeout import Timeout
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from swift.common.utils import normalize_timestamp, config_true_value, public
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from swift.common.bufferedhttp import http_connect
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from swift.common.constraints import MAX_ACCOUNT_NAME_LENGTH
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from swift.common.exceptions import ChunkReadTimeout, ConnectionTimeout
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from swift.common.http import is_informational, is_success, is_redirection, \
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is_server_error, HTTP_OK, HTTP_PARTIAL_CONTENT, HTTP_MULTIPLE_CHOICES, \
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HTTP_BAD_REQUEST, HTTP_NOT_FOUND, HTTP_SERVICE_UNAVAILABLE, \
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HTTP_INSUFFICIENT_STORAGE, HTTP_UNAUTHORIZED
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from swift.common.swob import Request, Response, status_map
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def update_headers(response, headers):
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"""
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Helper function to update headers in the response.
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:param response: swob.Response object
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:param headers: dictionary headers
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"""
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if hasattr(headers, 'items'):
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headers = headers.items()
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for name, value in headers:
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if name == 'etag':
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response.headers[name] = value.replace('"', '')
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elif name not in ('date', 'content-length', 'content-type',
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'connection', 'x-put-timestamp', 'x-delete-after'):
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response.headers[name] = value
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def source_key(resp):
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"""
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Provide the timestamp of the swift http response as a floating
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point value. Used as a sort key.
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:param resp: httplib response object
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"""
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return float(resp.getheader('x-put-timestamp') or
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resp.getheader('x-timestamp') or 0)
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def delay_denial(func):
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"""
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Decorator to declare which methods should have any swift.authorize call
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delayed. This is so the method can load the Request object up with
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additional information that may be needed by the authorization system.
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:param func: function for which authorization will be delayed
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"""
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func.delay_denial = True
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@functools.wraps(func)
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def wrapped(*a, **kw):
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return func(*a, **kw)
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return wrapped
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def get_account_memcache_key(account):
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return 'account/%s' % account
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def get_container_memcache_key(account, container):
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return 'container/%s/%s' % (account, container)
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def headers_to_container_info(headers, status_int=HTTP_OK):
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"""
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Construct a cacheable dict of container info based on response headers.
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"""
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headers = dict(headers)
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return {
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'status': status_int,
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'read_acl': headers.get('x-container-read'),
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'write_acl': headers.get('x-container-write'),
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'sync_key': headers.get('x-container-sync-key'),
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'count': headers.get('x-container-object-count'),
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'bytes': headers.get('x-container-bytes-used'),
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'versions': headers.get('x-versions-location'),
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'cors': {
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'allow_origin': headers.get(
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'x-container-meta-access-control-allow-origin'),
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'allow_headers': headers.get(
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'x-container-meta-access-control-allow-headers'),
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'max_age': headers.get(
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'x-container-meta-access-control-max-age')
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},
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'meta': dict((key.lower()[17:], value)
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for key, value in headers.iteritems()
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if key.lower().startswith('x-container-meta-'))
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}
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class Controller(object):
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"""Base WSGI controller class for the proxy"""
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server_type = 'Base'
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# Ensure these are all lowercase
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pass_through_headers = []
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def __init__(self, app):
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self.account_name = None
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self.app = app
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self.trans_id = '-'
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self.allowed_methods = set()
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all_methods = inspect.getmembers(self, predicate=inspect.ismethod)
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for name, m in all_methods:
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if getattr(m, 'publicly_accessible', False):
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self.allowed_methods.add(name)
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def transfer_headers(self, src_headers, dst_headers):
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st = self.server_type.lower()
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x_remove = 'x-remove-%s-meta-' % st
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x_remove_read = 'x-remove-%s-read' % st
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x_remove_write = 'x-remove-%s-write' % st
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x_meta = 'x-%s-meta-' % st
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dst_headers.update((k.lower().replace('-remove', '', 1), '')
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for k in src_headers
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if k.lower().startswith(x_remove) or
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k.lower() in (x_remove_read, x_remove_write))
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dst_headers.update((k.lower(), v)
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for k, v in src_headers.iteritems()
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if k.lower() in self.pass_through_headers or
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k.lower().startswith(x_meta))
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def error_increment(self, node):
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"""
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Handles incrementing error counts when talking to nodes.
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:param node: dictionary of node to increment the error count for
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"""
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node['errors'] = node.get('errors', 0) + 1
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node['last_error'] = time.time()
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def error_occurred(self, node, msg):
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"""
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Handle logging, and handling of errors.
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:param node: dictionary of node to handle errors for
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:param msg: error message
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"""
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self.error_increment(node)
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self.app.logger.error(_('%(msg)s %(ip)s:%(port)s'),
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{'msg': msg, 'ip': node['ip'],
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'port': node['port']})
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def exception_occurred(self, node, typ, additional_info):
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"""
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Handle logging of generic exceptions.
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:param node: dictionary of node to log the error for
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:param typ: server type
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:param additional_info: additional information to log
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"""
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self.app.logger.exception(
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_('ERROR with %(type)s server %(ip)s:%(port)s/%(device)s re: '
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'%(info)s'),
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{'type': typ, 'ip': node['ip'], 'port': node['port'],
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'device': node['device'], 'info': additional_info})
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def error_limited(self, node):
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"""
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Check if the node is currently error limited.
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:param node: dictionary of node to check
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:returns: True if error limited, False otherwise
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"""
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now = time.time()
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if not 'errors' in node:
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return False
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if 'last_error' in node and node['last_error'] < \
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now - self.app.error_suppression_interval:
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del node['last_error']
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if 'errors' in node:
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del node['errors']
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return False
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limited = node['errors'] > self.app.error_suppression_limit
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if limited:
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self.app.logger.debug(
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_('Node error limited %(ip)s:%(port)s (%(device)s)'), node)
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return limited
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def error_limit(self, node):
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"""
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Mark a node as error limited.
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:param node: dictionary of node to error limit
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"""
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node['errors'] = self.app.error_suppression_limit + 1
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node['last_error'] = time.time()
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def account_info(self, account, autocreate=False):
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"""
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Get account information, and also verify that the account exists.
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:param account: name of the account to get the info for
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:returns: tuple of (account partition, account nodes, container_count)
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or (None, None, None) if it does not exist
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"""
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partition, nodes = self.app.account_ring.get_nodes(account)
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# 0 = no responses, 200 = found, 404 = not found, -1 = mixed responses
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if self.app.memcache:
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cache_key = get_account_memcache_key(account)
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cache_value = self.app.memcache.get(cache_key)
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if not isinstance(cache_value, dict):
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result_code = cache_value
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container_count = 0
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else:
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result_code = cache_value['status']
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container_count = cache_value['container_count']
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if result_code == HTTP_OK:
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return partition, nodes, container_count
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elif result_code == HTTP_NOT_FOUND and not autocreate:
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return None, None, None
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result_code = 0
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container_count = 0
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attempts_left = len(nodes)
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path = '/%s' % account
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headers = {'x-trans-id': self.trans_id, 'Connection': 'close'}
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iternodes = self.iter_nodes(partition, nodes, self.app.account_ring)
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while attempts_left > 0:
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try:
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node = iternodes.next()
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except StopIteration:
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break
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attempts_left -= 1
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try:
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with ConnectionTimeout(self.app.conn_timeout):
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conn = http_connect(node['ip'], node['port'],
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node['device'], partition, 'HEAD',
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path, headers)
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with Timeout(self.app.node_timeout):
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resp = conn.getresponse()
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body = resp.read()
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if is_success(resp.status):
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result_code = HTTP_OK
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container_count = int(
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resp.getheader('x-account-container-count') or 0)
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break
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elif resp.status == HTTP_NOT_FOUND:
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if result_code == 0:
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result_code = HTTP_NOT_FOUND
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elif result_code != HTTP_NOT_FOUND:
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result_code = -1
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elif resp.status == HTTP_INSUFFICIENT_STORAGE:
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self.error_limit(node)
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continue
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else:
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result_code = -1
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except (Exception, Timeout):
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self.exception_occurred(node, _('Account'),
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_('Trying to get account info for %s')
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% path)
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if result_code == HTTP_NOT_FOUND and autocreate:
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if len(account) > MAX_ACCOUNT_NAME_LENGTH:
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return None, None, None
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headers = {'X-Timestamp': normalize_timestamp(time.time()),
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'X-Trans-Id': self.trans_id,
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'Connection': 'close'}
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resp = self.make_requests(Request.blank('/v1' + path),
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self.app.account_ring, partition, 'PUT',
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path, [headers] * len(nodes))
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if not is_success(resp.status_int):
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self.app.logger.warning('Could not autocreate account %r' %
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path)
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return None, None, None
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result_code = HTTP_OK
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if self.app.memcache and result_code in (HTTP_OK, HTTP_NOT_FOUND):
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if result_code == HTTP_OK:
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cache_timeout = self.app.recheck_account_existence
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else:
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cache_timeout = self.app.recheck_account_existence * 0.1
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self.app.memcache.set(cache_key,
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{'status': result_code,
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'container_count': container_count},
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timeout=cache_timeout)
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if result_code == HTTP_OK:
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return partition, nodes, container_count
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return None, None, None
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def container_info(self, account, container, account_autocreate=False):
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"""
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Get container information and thusly verify container existance.
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This will also make a call to account_info to verify that the
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account exists.
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:param account: account name for the container
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:param container: container name to look up
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:returns: dict containing at least container partition ('partition'),
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container nodes ('containers'), container read
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acl ('read_acl'), container write acl ('write_acl'),
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and container sync key ('sync_key').
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Values are set to None if the container does not exist.
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"""
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part, nodes = self.app.container_ring.get_nodes(account, container)
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path = '/%s/%s' % (account, container)
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container_info = {'status': 0, 'read_acl': None,
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'write_acl': None, 'sync_key': None,
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'count': None, 'bytes': None,
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'versions': None, 'partition': None,
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'nodes': None}
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if self.app.memcache:
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cache_key = get_container_memcache_key(account, container)
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cache_value = self.app.memcache.get(cache_key)
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if isinstance(cache_value, dict):
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if 'container_size' in cache_value:
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cache_value['count'] = cache_value['container_size']
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if is_success(cache_value['status']):
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container_info.update(cache_value)
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container_info['partition'] = part
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container_info['nodes'] = nodes
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return container_info
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if not self.account_info(account, autocreate=account_autocreate)[1]:
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return container_info
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attempts_left = len(nodes)
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headers = {'x-trans-id': self.trans_id, 'Connection': 'close'}
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for node in self.iter_nodes(part, nodes, self.app.container_ring):
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try:
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with ConnectionTimeout(self.app.conn_timeout):
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conn = http_connect(node['ip'], node['port'],
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node['device'], part, 'HEAD',
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path, headers)
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with Timeout(self.app.node_timeout):
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resp = conn.getresponse()
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body = resp.read()
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if is_success(resp.status):
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container_info.update(
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headers_to_container_info(resp.getheaders()))
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break
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elif resp.status == HTTP_NOT_FOUND:
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container_info['status'] = HTTP_NOT_FOUND
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else:
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container_info['status'] = -1
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if resp.status == HTTP_INSUFFICIENT_STORAGE:
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self.error_limit(node)
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except (Exception, Timeout):
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self.exception_occurred(
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node, _('Container'),
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_('Trying to get container info for %s') % path)
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attempts_left -= 1
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if attempts_left <= 0:
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break
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if self.app.memcache:
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if container_info['status'] == HTTP_OK:
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self.app.memcache.set(
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cache_key, container_info,
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timeout=self.app.recheck_container_existence)
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elif container_info['status'] == HTTP_NOT_FOUND:
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self.app.memcache.set(
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cache_key, container_info,
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timeout=self.app.recheck_container_existence * 0.1)
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if container_info['status'] == HTTP_OK:
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container_info['partition'] = part
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container_info['nodes'] = nodes
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return container_info
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def iter_nodes(self, partition, nodes, ring):
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"""
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Node iterator that will first iterate over the normal nodes for a
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partition and then the handoff partitions for the node.
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:param partition: partition to iterate nodes for
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:param nodes: list of node dicts from the ring
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:param ring: ring to get handoff nodes from
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"""
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for node in nodes:
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if not self.error_limited(node):
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yield node
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handoffs = 0
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for node in ring.get_more_nodes(partition):
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if not self.error_limited(node):
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handoffs += 1
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if self.app.log_handoffs:
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self.app.logger.increment('handoff_count')
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self.app.logger.warning(
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'Handoff requested (%d)' % handoffs)
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if handoffs == len(nodes):
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self.app.logger.increment('handoff_all_count')
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yield node
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def _make_request(self, nodes, part, method, path, headers, query,
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logger_thread_locals):
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self.app.logger.thread_locals = logger_thread_locals
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for node in nodes:
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try:
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with ConnectionTimeout(self.app.conn_timeout):
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conn = http_connect(node['ip'], node['port'],
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node['device'], part, method, path,
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headers=headers, query_string=query)
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conn.node = node
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with Timeout(self.app.node_timeout):
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resp = conn.getresponse()
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if not is_informational(resp.status) and \
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not is_server_error(resp.status):
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return resp.status, resp.reason, resp.read()
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elif resp.status == HTTP_INSUFFICIENT_STORAGE:
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self.error_limit(node)
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except (Exception, Timeout):
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self.exception_occurred(node, self.server_type,
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_('Trying to %(method)s %(path)s') %
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{'method': method, 'path': path})
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def make_requests(self, req, ring, part, method, path, headers,
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query_string=''):
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"""
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Sends an HTTP request to multiple nodes and aggregates the results.
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It attempts the primary nodes concurrently, then iterates over the
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handoff nodes as needed.
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:param headers: a list of dicts, where each dict represents one
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backend request that should be made.
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:returns: a swob.Response object
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"""
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start_nodes = ring.get_part_nodes(part)
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nodes = self.iter_nodes(part, start_nodes, ring)
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pile = GreenPile(len(start_nodes))
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for head in headers:
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pile.spawn(self._make_request, nodes, part, method, path,
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head, query_string, self.app.logger.thread_locals)
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response = [resp for resp in pile if resp]
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while len(response) < len(start_nodes):
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response.append((HTTP_SERVICE_UNAVAILABLE, '', ''))
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statuses, reasons, bodies = zip(*response)
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return self.best_response(req, statuses, reasons, bodies,
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'%s %s' % (self.server_type, req.method))
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def best_response(self, req, statuses, reasons, bodies, server_type,
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etag=None):
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"""
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Given a list of responses from several servers, choose the best to
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return to the API.
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:param req: swob.Request object
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:param statuses: list of statuses returned
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:param reasons: list of reasons for each status
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:param bodies: bodies of each response
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:param server_type: type of server the responses came from
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:param etag: etag
|
|
:returns: swob.Response object with the correct status, body, etc. set
|
|
"""
|
|
resp = Response(request=req)
|
|
if len(statuses):
|
|
for hundred in (HTTP_OK, HTTP_MULTIPLE_CHOICES, HTTP_BAD_REQUEST):
|
|
hstatuses = \
|
|
[s for s in statuses if hundred <= s < hundred + 100]
|
|
if len(hstatuses) > len(statuses) / 2:
|
|
status = max(hstatuses)
|
|
status_index = statuses.index(status)
|
|
resp.status = '%s %s' % (status, reasons[status_index])
|
|
resp.body = bodies[status_index]
|
|
resp.content_type = 'text/html'
|
|
if etag:
|
|
resp.headers['etag'] = etag.strip('"')
|
|
return resp
|
|
self.app.logger.error(_('%(type)s returning 503 for %(statuses)s'),
|
|
{'type': server_type, 'statuses': statuses})
|
|
resp.status = '503 Internal Server Error'
|
|
return resp
|
|
|
|
@public
|
|
def GET(self, req):
|
|
"""Handler for HTTP GET requests."""
|
|
return self.GETorHEAD(req)
|
|
|
|
@public
|
|
def HEAD(self, req):
|
|
"""Handler for HTTP HEAD requests."""
|
|
return self.GETorHEAD(req)
|
|
|
|
def _make_app_iter_reader(self, node, source, queue, logger_thread_locals):
|
|
"""
|
|
Reads from the source and places data in the queue. It expects
|
|
something else be reading from the queue and, if nothing does within
|
|
self.app.client_timeout seconds, the process will be aborted.
|
|
|
|
:param node: The node dict that the source is connected to, for
|
|
logging/error-limiting purposes.
|
|
:param source: The httplib.Response object to read from.
|
|
:param queue: The eventlet.queue.Queue to place read source data into.
|
|
:param logger_thread_locals: The thread local values to be set on the
|
|
self.app.logger to retain transaction
|
|
logging information.
|
|
"""
|
|
self.app.logger.thread_locals = logger_thread_locals
|
|
success = True
|
|
try:
|
|
try:
|
|
while True:
|
|
with ChunkReadTimeout(self.app.node_timeout):
|
|
chunk = source.read(self.app.object_chunk_size)
|
|
if not chunk:
|
|
break
|
|
queue.put(chunk, timeout=self.app.client_timeout)
|
|
except Full:
|
|
self.app.logger.warn(
|
|
_('Client did not read from queue within %ss') %
|
|
self.app.client_timeout)
|
|
self.app.logger.increment('client_timeouts')
|
|
success = False
|
|
except (Exception, Timeout):
|
|
self.exception_occurred(node, _('Object'),
|
|
_('Trying to read during GET'))
|
|
success = False
|
|
finally:
|
|
# Ensure the queue getter gets a terminator.
|
|
queue.resize(2)
|
|
queue.put(success)
|
|
# Close-out the connection as best as possible.
|
|
if getattr(source, 'swift_conn', None):
|
|
self.close_swift_conn(source)
|
|
|
|
def _make_app_iter(self, node, source):
|
|
"""
|
|
Returns an iterator over the contents of the source (via its read
|
|
func). There is also quite a bit of cleanup to ensure garbage
|
|
collection works and the underlying socket of the source is closed.
|
|
|
|
:param source: The httplib.Response object this iterator should read
|
|
from.
|
|
:param node: The node the source is reading from, for logging purposes.
|
|
"""
|
|
try:
|
|
# Spawn reader to read from the source and place in the queue.
|
|
# We then drop any reference to the source or node, for garbage
|
|
# collection purposes.
|
|
queue = Queue(1)
|
|
spawn_n(self._make_app_iter_reader, node, source, queue,
|
|
self.app.logger.thread_locals)
|
|
source = node = None
|
|
while True:
|
|
chunk = queue.get(timeout=self.app.node_timeout)
|
|
if isinstance(chunk, bool): # terminator
|
|
success = chunk
|
|
if not success:
|
|
raise Exception(_('Failed to read all data'
|
|
' from the source'))
|
|
break
|
|
yield chunk
|
|
except Empty:
|
|
raise ChunkReadTimeout()
|
|
except (GeneratorExit, Timeout):
|
|
self.app.logger.warn(_('Client disconnected on read'))
|
|
except Exception:
|
|
self.app.logger.exception(_('Trying to send to client'))
|
|
raise
|
|
|
|
def close_swift_conn(self, src):
|
|
try:
|
|
src.swift_conn.close()
|
|
except Exception:
|
|
pass
|
|
src.swift_conn = None
|
|
try:
|
|
while src.read(self.app.object_chunk_size):
|
|
pass
|
|
except Exception:
|
|
pass
|
|
try:
|
|
src.close()
|
|
except Exception:
|
|
pass
|
|
|
|
def is_good_source(self, src):
|
|
"""
|
|
Indicates whether or not the request made to the backend found
|
|
what it was looking for.
|
|
"""
|
|
return is_success(src.status) or is_redirection(src.status)
|
|
|
|
def GETorHEAD_base(self, req, server_type, partition, nodes, path,
|
|
attempts):
|
|
"""
|
|
Base handler for HTTP GET or HEAD requests.
|
|
|
|
:param req: swob.Request object
|
|
:param server_type: server type
|
|
:param partition: partition
|
|
:param nodes: nodes
|
|
:param path: path for the request
|
|
:param attempts: number of attempts to try
|
|
:returns: swob.Response object
|
|
"""
|
|
statuses = []
|
|
reasons = []
|
|
bodies = []
|
|
sources = []
|
|
newest = config_true_value(req.headers.get('x-newest', 'f'))
|
|
nodes = iter(nodes)
|
|
while len(statuses) < attempts:
|
|
try:
|
|
node = nodes.next()
|
|
except StopIteration:
|
|
break
|
|
if self.error_limited(node):
|
|
continue
|
|
try:
|
|
with ConnectionTimeout(self.app.conn_timeout):
|
|
headers = dict(req.headers)
|
|
headers['Connection'] = 'close'
|
|
conn = http_connect(
|
|
node['ip'], node['port'], node['device'], partition,
|
|
req.method, path, headers=headers,
|
|
query_string=req.query_string)
|
|
with Timeout(self.app.node_timeout):
|
|
possible_source = conn.getresponse()
|
|
# See NOTE: swift_conn at top of file about this.
|
|
possible_source.swift_conn = conn
|
|
except (Exception, Timeout):
|
|
self.exception_occurred(
|
|
node, server_type, _('Trying to %(method)s %(path)s') %
|
|
{'method': req.method, 'path': req.path})
|
|
continue
|
|
if self.is_good_source(possible_source):
|
|
# 404 if we know we don't have a synced copy
|
|
if not float(possible_source.getheader('X-PUT-Timestamp', 1)):
|
|
statuses.append(HTTP_NOT_FOUND)
|
|
reasons.append('')
|
|
bodies.append('')
|
|
self.close_swift_conn(possible_source)
|
|
else:
|
|
statuses.append(possible_source.status)
|
|
reasons.append(possible_source.reason)
|
|
bodies.append('')
|
|
sources.append(possible_source)
|
|
if not newest: # one good source is enough
|
|
break
|
|
else:
|
|
statuses.append(possible_source.status)
|
|
reasons.append(possible_source.reason)
|
|
bodies.append(possible_source.read())
|
|
if possible_source.status == HTTP_INSUFFICIENT_STORAGE:
|
|
self.error_limit(node)
|
|
elif is_server_error(possible_source.status):
|
|
self.error_occurred(node, _('ERROR %(status)d %(body)s '
|
|
'From %(type)s Server') %
|
|
{'status': possible_source.status,
|
|
'body': bodies[-1][:1024],
|
|
'type': server_type})
|
|
if sources:
|
|
sources.sort(key=source_key)
|
|
source = sources.pop()
|
|
for src in sources:
|
|
self.close_swift_conn(src)
|
|
res = Response(request=req, conditional_response=True)
|
|
if req.method == 'GET' and \
|
|
source.status in (HTTP_OK, HTTP_PARTIAL_CONTENT):
|
|
res.app_iter = self._make_app_iter(node, source)
|
|
# See NOTE: swift_conn at top of file about this.
|
|
res.swift_conn = source.swift_conn
|
|
res.status = source.status
|
|
update_headers(res, source.getheaders())
|
|
if not res.environ:
|
|
res.environ = {}
|
|
res.environ['swift_x_timestamp'] = \
|
|
source.getheader('x-timestamp')
|
|
res.accept_ranges = 'bytes'
|
|
res.content_length = source.getheader('Content-Length')
|
|
if source.getheader('Content-Type'):
|
|
res.charset = None
|
|
res.content_type = source.getheader('Content-Type')
|
|
return res
|
|
return self.best_response(req, statuses, reasons, bodies,
|
|
'%s %s' % (server_type, req.method))
|
|
|
|
def OPTIONS_base(self, req):
|
|
"""
|
|
Base handler for OPTIONS requests
|
|
|
|
:param req: swob.Request object
|
|
:returns: swob.Response object
|
|
"""
|
|
headers = {'Allow': ', '.join(self.allowed_methods)}
|
|
resp = Response(status=200, request=req,
|
|
headers=headers)
|
|
req_origin_value = req.headers.get('Origin', None)
|
|
if not req_origin_value:
|
|
# NOT a CORS request
|
|
return resp
|
|
|
|
# CORS preflight request
|
|
try:
|
|
container_info = \
|
|
self.container_info(self.account_name, self.container_name)
|
|
except AttributeError:
|
|
container_info = {}
|
|
cors = container_info.get('cors', {})
|
|
allowed_origins = set()
|
|
if cors.get('allow_origin'):
|
|
allowed_origins.update(cors['allow_origin'].split(' '))
|
|
if self.app.cors_allow_origin:
|
|
allowed_origins.update(self.app.cors_allow_origin)
|
|
if (req_origin_value not in allowed_origins and
|
|
'*' not in allowed_origins) or (
|
|
req.headers.get('Access-Control-Request-Method') not in
|
|
self.allowed_methods):
|
|
resp.status = HTTP_UNAUTHORIZED
|
|
return resp # CORS preflight request that isn't valid
|
|
headers['access-control-allow-origin'] = req_origin_value
|
|
if cors.get('max_age', None) is not None:
|
|
headers['access-control-max-age'] = '%d' % cors.get('max_age')
|
|
headers['access-control-allow-methods'] = ', '.join(
|
|
self.allowed_methods)
|
|
if cors.get('allow_headers'):
|
|
headers['access-control-allow-headers'] = cors.get('allow_headers')
|
|
resp.headers = headers
|
|
return resp
|
|
|
|
@public
|
|
def OPTIONS(self, req):
|
|
return self.OPTIONS_base(req)
|